My wife hardly ever plays. And when she does we both end up getting frustrated. She is a pretty terrible player (just keeps hitting the flippers nonstop with no real intentions). I try to help but the conversation usually goes something like this:

Me: "Try to hold the ball with the flipper and pick your shot."
Her: "I don't like to do it that way"
Me: "But that is why you keep losing the ball, it's more fun if you can control the ball"
Her: (Keeps playing the same stupid way)
Me: (getting more and more frustrated as she doesn't take any of my tips/advice)
Her: (Gets frustrated with the game because she can't control the ball and it drains quickly. Says the game is "unfair". Hates pinball even more than before)

In the end I don't mind that she is not into pinball. It is my hobby and I can escape to my pinball room to play in peace and quiet. She has her things, I have mine. I like it that way.